Specifications

2.4.3 Disconnecting Power Supply

Before disconnecting the power supply from the POWER pin make sure the Java Box Terminal

is in a safe condition. A safe condition is waiting 2s after the "SHUTDOWN" result code has

been indicated.

2.5 GPIO Interface Specification

All General Purpose input / output are connected to the related pins of the Motorola G24 module over a

100 Ohms series resistor. The following table shows the logic level specifications in the Java Box

terminal interface circuits:

LEVEL MIN MAX

Input high level 2.0V 3.0V

Input low level 0V 0.4V

Output high level 2.5V 2.8V

Output low level 0V 0.2V

Table 4: GPIO Signal states level apply to G24 OEM

All GPIO normally HIGH with internal pull up resistor of 22k, to indicate that a LOW signal on the GPIO

connect the GPIO to GND, for HIGH signal leave the GPIO open.

2.6 RS232 number 1__ Interface G24 UART1

The serial interface RS232 number 1 of the Java Box Terminal is intended for the communication

between the GSM module and the host application. This RS232 interface is a data and control interface

for transmitting data, AT commands and providing multiplexed channels. EMC immunity

complies with the vehicular environment requirements according to EN 301 489-7.

The user interface of the Java Box Terminal is accessible from a Data Terminal Equipment DTE

connected to the RS232 interface and it is managed by AT commands according to the GSM 07.07 and

07.05 specification and the supported commands are

listed in the AT Commands Reference Guide.

Figure 12: Pin assignment RS-232 Table 5: D-Sub 9-pole female RS232

(D-Sub 9-pole female)

Connector type on the terminal is:

• RS-232 through D9-pin female

• Baud rate from 300 to 460,600 bit/s

• Autobauding (300 to 57,600 bit/s)

• Short circuit (to Ground) protection on all outputs.

• Input voltage range: -12V to +12V

Note: some of the RRS232 pin as dual use as GPIO, refer to table 1.

Java Box Terminal Hardware Interface Description

Released

no.

Signal name I/O Function of application

1 DCD O Data Carrier Detected

2 RXD O Receive Data

3 TXD I Transmit Data

4 DTR I Data Terminal Ready

5 GND - Ground

6 DSR O Data Set Ready

7 RTS I Request To Send

8 CTS O Clear To Send

9 RING O Ring Indication